You have an IQ above 140 if you can solve this math puzzle in 9 seconds. Go ahead and test your intelligence now!

Find out how smart you are (and increase your IQ ... questions are designed to be very difficult. If you cannot figure out the answer, simply select I don't know and move on. After finishing this ...

THIS mind-boggling optical illusion has puzzle fanatics stumped and struggling to find the answer – but do you have what it ...

Are you outgoing or introverted? Do you have a high traditional IQ or emotional IQ? Do you have what it takes to be an entrepreneur? Find the answers to these questions and more with Psychology Today.

" width="1200" height="675" /> Brain teasers are a form of puzzle that tests the reader's critical thinking and ...

" width="1200" height="675" /> Picture puzzles are a form of brain teaser that tests the reader's critical thinking and ...

This IQ test is a fun way to test your intelligence ... the answer has been given right below the question, so make sure you don’t scroll too far and cheat! If you remember, each door poses ...

People with the sharpest eyes can find the odd dinosaur in the picture in 5 seconds. Are you one of them? Test your visual ...

The majority of children who do not take or pass IQ-style entrance exams to private- or grammar schools, will have many qualities not measured on an IQ test. They may also just be late developers.

This optical illusion challenge tests your IQ and observational skills. The task is to find a hidden cat in an image within ...

The world's shortest IQ test will grill people with just three math questions, and only 17 per cent have managed to answer all correctly. Called the Cognitive Reflection Test, the set of questions ...

This calculation can be used for hypothesis testing in statistics Adam Hayes, Ph.D., CFA, is a financial writer with 15+ years Wall Street experience as a derivatives trader. Besides his extensive ...